→Namespace restrictions: fix links
* Searching the image namespace means searching the image descriptions, i.e. the first parts of the image description pages.
* Check or uncheck the tickbox "List redirects" in "Search in namespaces" box found at the bottom of a search results page.
* The source text (what one sees in the edit box, also called [[wiki text]]) is searched. This distinction is relevant for [[piped link]]s, for [[Wikipedia:interlanguage link]]s (to find links to Chinese articles, search for zh, not for Zhongwen), special characters (if ê is coded as &ecirc; it is found searching for ecirc), etc.
For a more exhaustive list of techniques, please see [http://meta.wikimedia.org/wiki/Help:Searching meta:Help:Searching] and [http://en.wikipedia.org/wiki/Wikipedia:Searching Wikipedia:Searching].